}
#ifndef DISABLE_LEGACY
+static const char *get_cipher_name(cipher_t *cipher) {
+ size_t keylen = cipher_keylength(cipher);
+
+ if(keylen <= 16) {
+ return "aes-128-cfb";
+ } else if(keylen <= 24) {
+ return "aes-192-cfb";
+ } else {
+ return "aes-256-cfb";
+ }
+}
+
bool send_metakey(connection_t *c) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy) {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
return false;
}
- if(!read_rsa_public_key(&c->rsa, c->config_tree, c->name)) {
+ rsa_t *rsa = read_rsa_public_key(c->config_tree, c->name);
+
+ if(!rsa) {
return false;
}
+ legacy_ctx_t *ctx = new_legacy_ctx(rsa);
+
/* We need to use a stream mode for the meta protocol. Use AES for this,
but try to match the key size with the one from the cipher selected
by Cipher.
*/
- size_t keylen = cipher_keylength(myself->incipher);
- const char *cipher_name;
-
- if(keylen <= 16) {
- cipher_name = "aes-128-cfb";
- } else if(keylen <= 24) {
- cipher_name = "aes-192-cfb";
- } else {
- cipher_name = "aes-256-cfb";
- }
-
- if(!cipher_open_by_name(&c->outcipher, cipher_name)) {
- return false;
- }
-
- c->outbudget = cipher_budget(&c->outcipher);
+ const char *cipher_name = get_cipher_name(myself->incipher);
- if(!digest_open_by_name(&c->outdigest, "sha256", DIGEST_ALGO_SIZE)) {
- cipher_close(&c->outcipher);
+ if(!init_crypto_by_name(&ctx->out, cipher_name, "sha256")) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest to %s (%s)", c->name, c->hostname);
+ free_legacy_ctx(ctx);
return false;
}
- const size_t len = rsa_size(c->rsa);
+ const size_t len = rsa_size(ctx->rsa);
char *key = alloca(len);
char *enckey = alloca(len);
char *hexkey = alloca(2 * len + 1);
key[0] &= 0x7F;
- if(!cipher_set_key_from_rsa(&c->outcipher, key, len, true)) {
+ if(!cipher_set_key_from_rsa(&ctx->out.cipher, key, len, true)) {
+ free_legacy_ctx(ctx);
return false;
}
with a length equal to that of the modulus of the RSA key.
*/
- if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
+ if(!rsa_public_encrypt(ctx->rsa, key, len, enckey)) {
+ free_legacy_ctx(ctx);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
+ free_legacy_ctx(c->legacy);
+ c->legacy = ctx;
+
/* Convert the encrypted random data to a hexadecimal formatted string */
bin2hex(enckey, hexkey, len);
/* Send the meta key */
bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
- cipher_get_nid(&c->outcipher),
- digest_get_nid(&c->outdigest), c->outmaclength,
+ cipher_get_nid(&c->legacy->out.cipher),
+ digest_get_nid(&c->legacy->out.digest), c->outmaclength,
c->outcompression, hexkey);
c->status.encryptout = true;
}
bool metakey_h(connection_t *c, const char *request) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy || !c->legacy) {
return false;
}
char hexkey[MAX_STRING_SIZE];
- int cipher, digest, maclength, compression;
- const size_t len = rsa_size(myself->connection->rsa);
+ int cipher, digest;
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
char *enckey = alloca(len);
char *key = alloca(len);
- if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
+ if(sscanf(request, "%*d %d %d %*d %*d " MAX_STRING, &cipher, &digest, hexkey) != 3) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
return false;
}
/* Decrypt the meta key */
- if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
+ if(!rsa_private_decrypt(myself->connection->legacy->rsa, enckey, len, key)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
/* Check and lookup cipher and digest algorithms */
- if(cipher) {
- if(!cipher_open_by_nid(&c->incipher, cipher) || !cipher_set_key_from_rsa(&c->incipher, key, len, false)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
- return false;
- }
- } else {
- logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null cipher");
+ if(!cipher || !digest) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): cipher %d, digest %d", c->name, c->hostname, cipher, digest);
return false;
}
- c->inbudget = cipher_budget(&c->incipher);
+ if(!init_crypto_by_nid(&c->legacy->in, cipher, digest)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest from %s (%s)", c->name, c->hostname);
+ return false;
+ }
- if(digest) {
- if(!digest_open_by_nid(&c->indigest, digest, DIGEST_ALGO_SIZE)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
- return false;
- }
- } else {
- logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null digest");
+ if(!cipher_set_key_from_rsa(&c->legacy->in.cipher, key, len, false)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error setting RSA key for %s (%s)", c->name, c->hostname);
return false;
}
+
c->status.decryptin = true;
c->allow_request = CHALLENGE;
}
bool send_challenge(connection_t *c) {
- const size_t len = rsa_size(c->rsa);
+ const size_t len = rsa_size(c->legacy->rsa);
char *buffer = alloca(len * 2 + 1);
c->hischallenge = xrealloc(c->hischallenge, len);
}
bool challenge_h(connection_t *c, const char *request) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy) {
return false;
}
char buffer[MAX_STRING_SIZE];
- const size_t len = rsa_size(myself->connection->rsa);
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
}
bool send_chal_reply(connection_t *c) {
- const size_t len = rsa_size(myself->connection->rsa);
- size_t digestlen = digest_length(&c->indigest);
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
+ size_t digestlen = digest_length(&c->legacy->in.digest);
char *digest = alloca(digestlen * 2 + 1);
/* Calculate the hash from the challenge we received */
- if(!digest_create(&c->indigest, c->mychallenge, len, digest)) {
+ if(!digest_create(&c->legacy->in.digest, c->mychallenge, len, digest)) {
return false;
}
/* Check if the length of the hash is all right */
- if(inlen != digest_length(&c->outdigest)) {
+ if(inlen != digest_length(&c->legacy->out.digest)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
return false;
}
/* Verify the hash */
- if(!digest_verify(&c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
+ if(!digest_verify(&c->legacy->out.digest, c->hischallenge, rsa_size(c->legacy->rsa), hishash)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
return false;
}
projects / tinc / blobdiff